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Old 12-20-2022, 11:29 AM   #1
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Hello - 1994 MCI Cooling Fans

I have a 1994 mci converting it. Shelled now. Hope to have it done by next year summer. I have removed old systems and putting in updated stuff. Wondering about the cooling. It has tbe 6v92 single turbo. I have removed the old squirrel cage and will be replacing it with some electric fans. They are rated for 3000cfm. One will be on the inside of each one and outside of each one and an additional one on each cutout area above the engine blowing onto the engine. What is the cfm rating for the old squirrel cage fan. Does anyone know
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Old 12-20-2022, 07:01 PM   #2
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Maybe it can work. Not to be that guy because I don't want to discourage you at all., But I think you should have done some more research before hand. There also engineering that goes into push or pull fan shrouds to use all the surface area of radiator. Being in the back or side , there's no help pushing into the wind while driving like a semi. The indirect fans to cool a diesel stack ,can pull up to or above 50hp from the motor to at max cooling air flow. If like some MH you have radiator,trans,hydraulic PS cooling and AC condenser in a stack. Blade design of fan can also come into play to create higher static pressure. My guess you'll find more info in a google search or in bus conversion forums than in vintage mixed group here.
I applaud your efforts to do a conversion and would like to follow your build.
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Old 12-21-2022, 04:28 AM   #3
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I agree a bus conversion forum would probably be a better source for that info, though I think it's going to be difficult to find, electric fans aren't common conversions.

An alternative if you still have the original fan, shrouding and drive. With measurements from the fan, the number of blades, drive and driven pulley diameters to determine the fan operating RPM range old engineering manuals or a good manufacturers website might be able to give you a rough idea of CFM produced.

One other consideration, the fans move an incredible amount of air, which takes a lot of power. You're probably going to have to add an alternator to the engine dedicated to powering the fans.

Just my nickel if you're looking at an empty shell. You've got a couple of thousand hours of work ahead of you. GM and MCI spent thousands of hours designing a chassis and drive train that is dependable and works. Don't redesign it, go through it, look at every wear part and parts that don't normally wear. I'm guessing it has half a million miles if not more and there's a lot that could use attention. Make that reliable, there's not much worse than breaking down 1500 miles from home during a trip you've planned for months. Spend your engineering time, effort, and money on a killer interior. With the electronics today there are some amazing things you can do.
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Old 12-21-2022, 06:29 AM   #4
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Sounds like a great project. If it were me I would try to lift as many parts out of one specific chassis to make future maintenance easier.

So perhaps focus on a Freightliner or Spartan Class A chassis to pull parts and schematics from.
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Old 12-22-2022, 04:14 AM   #5
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You might want to read the above thread. It's not an MCI and it's rear radiator but a good explanation of what he did and the reasons. It will give you a good idea of the direction you need to go.
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Old 12-22-2022, 06:41 AM   #6
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MCI doesnt know. Sam's marine. Ive spoken to a lot of people. BCM. Busnuts. Ive already scrapped most of whats going to be replaced. New batteries around 8. 2 alternators to cover all power needs. The old one is obsolete and cant be rebuilt.
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fan, cooling

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